Production and Use of Sub-High Temperature PET Tea Beverage Bottles (I)

Tea beverages first appeared in the U.S. market in the 1970s. It was initially targeted at consumers with soft drinks containing glass or PET bottles. The successful development of the portable non-gasified PET bottled tea beverage in Japan in the early 1980s enabled it to be further promoted and became popular in Taiwan, Europe and the United States. Tea beverages, as the world's three major non-alcoholic beverages, are rich in health and nutrition components such as tea polyphenols, catechins, various amino acids, trace elements, vitamins, and carbohydrates. It has a low calorie value, low sodium, irritation, refreshing, light, glycol quality style, in line with modern people's pursuit of health concepts. Its beneficial effects such as refreshing diuretic and assisting digestion have long been recognized by consumers, and modern medicine has confirmed its antihypertensive, lipid-lowering, hypoglycemic and anti-atherogenic atherosclerosis, anti-cancer, anti-aging and other Health effects.

In view of the above-mentioned functions of tea beverages and the huge demand of the market, it is urgent for the beverage industry to vigorously develop and promote tea beverage products, but the market price of plastic bottles as tea beverage packaging containers is too high (since the process requires production of filling temperature More than 90 °C), so the quality of the bottle (mainly high heat resistance requirements), is currently the bottleneck that plagued the production of tea beverages. How to break through this barrier to meet the requirements of SMEs for the production of tea beverages, reduce production costs, and maximize the benefits to consumers in order to facilitate the full promotion of tea beverages

(At the same time, the hot filling of juice and dairy products has the same guiding role.) This article will focus on the following aspects.

1 Production of sub-high temperature PET bottles 2.1 Production equipment H-6s marine piston air compressor (Tianjin), QCS-18 multifunctional far infrared plastic tube blank heater (Zhejiang), SAD-1HF frozen air drying (Zhejiang), multi-purpose high-pressure blow molding machine (Zhejiang).

2 Sub-high temperature PET bottle PET chemical name: polyethylene terephthalate (Polyethylene) is a thermoplastic material, which is generally formed by esterification of ethylene terephthalate to form monomers, and then undergo polymerization. Polymer is formed. The so-called sub-high temperature PET bottles are used to fill the PET bottles used in the sub-high temperature production process (filling temperature is 80-85°C). It is used when compared to high temperature filling (filling temperature requirements are above 90%). In terms of packaging containers. At present, some well-known brands of tea beverages on the domestic market mostly use high-temperature filling technology. The PET bottles generally exceed 95°C in heat resistance, and some even exceed 100°C. In this way, there are high requirements for the processing equipment for tea beverage filling and the production operation of employees. At the same time, the contents of tea beverages are in a high temperature state for a long time, which will certainly cause certain adverse effects on the quality and nutritional composition of tea beverages. The use of sub-high temperature plastic bottle filling can effectively overcome this defect.

2.2 Production Process

2.3 Operating Procedures

2.3.1 Tube Blanks Pick-up qualified bottles with no defects, moderate thickness, no bottle defects, and uniform masterbatch are to be used. Bottles used for hot filling generally require special treatment of the bottle mouth, otherwise the bottle mouth will be deformed due to heat during the filling process, resulting in product sealing failure and quality problems. Two-step blowing is generally solved by crystallizing the mouth of the tube blank. When the PET material is in a crystalline state, its heat resistance is greatly improved and it can resist the temperature of hot filling without deformation. The bottle mouth is crystallized by heating the bottle mouth portion individually and holding it for a sufficient time to crystallize it.

2.3.2 The billet heater is different from the height of the sub-bulb and the shape of the blown bottle; the temperature of each heating section when the tube is being heated should be able to be adjusted to adapt to different temperature values ​​required for different heights of the tube. The heat source of the heater is an infrared heating tube. A certain number of heating tubes are arranged parallel to the horizontal direction at the outside of the rotating passage of the heating furnace. The heating power of each group can be adjusted, and the preforms are transported and heated in the heating furnace. It is continuously rotated so that the preform temperature can be controlled in sections along the height direction according to the actual needs of the blowing bottle. During the heating process, if the bottle mouth is heated, it will cause undesired deformation. Therefore, the portion of the bottle mouth (even if the crystallization is pretreated) must be protected from exposure to higher temperatures. After the preforms have been heat-treated, they have been segmented to the desired temperature, so that the molecular structure of the blown bottles can be distributed according to the design requirements, with an ideal uniform thickness and mechanical properties.

2.3.4 The blowing process of the blowing machine is divided into five stages: mold clamping, stretching, extension blowing, air blowing and cooling. After the tube blank has completed the temperature adjustment process, the tube blank is quickly sent from the outlet of the rotary heating furnace to the blowing mold. The mold is closed, and the stretching rod moves downwards under the action of the cylinder and drives the tube to stretch in the axial direction. The speed of stretching has a great influence on the quality of the bottles that are blown out. If the speed is too fast, the materials at the bottom of the bottles are distributed too much. As a result, the material distribution of the bottle body is insufficient and the overall mechanical properties are seriously deficient. Of course, if the speed is too slow, the material at the bottom of the bottle will be too small, which will cause perforation of the preform and will not blow out the ideal bottle. Take a 500ml bottle as an example. The blowing parameters are as follows: Closing time 5-6s, Closing delay 1

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